During World War I, Klaus Schneider, a train conductor, is hospitalized for head injuries. His doctor, Dr. Bettelheim, discovers Schneider's clairvoyant abilities. Post-war, he reconnects with Captain Nowotny, who becomes his advisor. Schneider, now known as Erik Jan Hanussen, becomes a successful variety star after Nowotny's guidance. He gains fame for predicting a cruise ship's sinking but faces arrest and trial for fraud. However, he's acquitted after showcasing his abilities in court.
In Berlin, where he resides with his girlfriend Valery (Wally) and Nowotny, he socializes with the elite. Despite his earlier claims of being apolitical, he predicts Adolf Hitler's rise to Chancellor, causing tension with Nowotny and Wally. When he foresees the Reichstag fire, the Nazis brand him a traitor, leading to his murder by the SA on March 24-25, 1933, likely influenced by his Jewish background.